Maximum Floor Slope

The building code requires that a garage floor be sloped towards the door but does not specify a minimum slope.

Maximum floor slope.

Floor testing testing on slopes. Floors that slope 2 or 3 inches in 20 feet would be a very serious concern. Another consideration regardless of the amount of slope is whether there is structural damage in the home or only cosmetic damage. A 2 slope will probably ensure better drainage we could also find no slope tolerance for use when a floor slope is specified.

Shower floor slope to efficiently drain the recommended minimum slope for a shower floor is about 4 percent or a 1 2 inch drop per every 12 inches from the shower walls to the drain. Floor slopes shall be reasonably uniform and comply with 5 6 1 through 5 6 3. 5 6 2 changes in slope between shallow and deep. 5 6 1 the slope of the floor from the shallow end wall towards the deep area shall not exceed 1 foot in 7 feet 30 cm.

I d slope it as much as you can stand. 213 cm to the point of the first slope change as shown in figure 5. Nearly all will say that if a floor slopes 1 and 1 2 inches in twenty feet or more that there should be further investigation. Your figure of 1 4 per foot doesn t sound bad.

Here is the citation from the international residential code irc. When they poured my garage slab in my last house i asked em to slope it a lot. But they got one low spot right where i got out of my car. So during the winter melted snow and rain would puddle there and freeze.